📄 os_mem.src
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; .\OS_MEM.SRC generated from: OS_MEM.C
; COMPILER INVOKED BY:
; C:\Keil\C51\BIN\C51.EXE OS_MEM.C LARGE BROWSE ORDER NOAREGS DEBUG OBJECTEXTEND SRC(.\OS_MEM.SRC)
$NOMOD51
NAME OS_MEM
P0 DATA 080H
P1 DATA 090H
P2 DATA 0A0H
P3 DATA 0B0H
PSW DATA 0D0H
ACC DATA 0E0H
B DATA 0F0H
SP DATA 081H
DPL DATA 082H
DPH DATA 083H
PCON DATA 087H
TCON DATA 088H
TMOD DATA 089H
TL0 DATA 08AH
TL1 DATA 08BH
TH0 DATA 08CH
TH1 DATA 08DH
IE DATA 0A8H
IP DATA 0B8H
SCON DATA 098H
SBUF DATA 099H
CY BIT 0D0H.7
AC BIT 0D0H.6
F0 BIT 0D0H.5
RS1 BIT 0D0H.4
RS0 BIT 0D0H.3
OV BIT 0D0H.2
P BIT 0D0H.0
TF1 BIT 088H.7
TR1 BIT 088H.6
TF0 BIT 088H.5
TR0 BIT 088H.4
IE1 BIT 088H.3
IT1 BIT 088H.2
IE0 BIT 088H.1
IT0 BIT 088H.0
EA BIT 0A8H.7
ES BIT 0A8H.4
ET1 BIT 0A8H.3
EX1 BIT 0A8H.2
ET0 BIT 0A8H.1
EX0 BIT 0A8H.0
PS BIT 0B8H.4
PT1 BIT 0B8H.3
PX1 BIT 0B8H.2
PT0 BIT 0B8H.1
PX0 BIT 0B8H.0
RD BIT 0B0H.7
WR BIT 0B0H.6
T1 BIT 0B0H.5
T0 BIT 0B0H.4
INT1 BIT 0B0H.3
INT0 BIT 0B0H.2
TXD BIT 0B0H.1
RXD BIT 0B0H.0
SM0 BIT 098H.7
SM1 BIT 098H.6
SM2 BIT 098H.5
REN BIT 098H.4
TB8 BIT 098H.3
RB8 BIT 098H.2
TI BIT 098H.1
RI BIT 098H.0
; /*
; *********************************************************************************************************
; * uC/OS-II
; * The Real-Time Kernel
; * MEMORY MANAGEMENT
; *
; * (c) Copyright 1992-2002, Jean J. Labrosse, Weston, FL
; * All Rights Reserved
; *
; * File : OS_MEM.C
; * By : Jean J. Labrosse
; *********************************************************************************************************
; */
;
; #ifndef OS_MASTER_FILE
; #include "includes.h"
; #endif
;
; #if (OS_MEM_EN > 0) && (OS_MAX_MEM_PART > 0)
; /*
; *********************************************************************************************************
; * CREATE A MEMORY PARTITION
; *
; * Description : Create a fixed-sized memory partition that will be managed by uC/OS-II.
; *
; * Arguments : addr is the starting address of the memory partition
; *
; * nblks is the number of memory blocks to create from the partition.
; *
; * blksize is the size (in bytes) of each block in the memory partition.
; *
; * err is a pointer to a variable containing an error message which will be set by
; * this function to either:
; *
; * OS_NO_ERR if the memory partition has been created correctly.
; * OS_MEM_INVALID_ADDR you are specifying an invalid address for the memory
; * storage of the partition.
; * OS_MEM_INVALID_PART no free partitions available
; * OS_MEM_INVALID_BLKS user specified an invalid number of blocks (must be >= 2)
; * OS_MEM_INVALID_SIZE user specified an invalid block size
; * (must be greater than the size of a pointer)
; * Returns : != (OS_MEM *)0 is the partition was created
; * == (OS_MEM *)0 if the partition was not created because of invalid arguments or, no
; * free partition is available.
; *********************************************************************************************************
; */
;
; OS_MEM *OSMemCreate (void *addr, INT32U nblks, INT32U blksize, INT8U *err)
; {
;
; OS_MEM *pmem;
; INT8U *pblk;
; void **plink;
; INT32U i;
;
;
; #if OS_ARG_CHK_EN > 0
; if (addr == (void *)0) { /* Must pass a valid address for the memory part. */
; *err = OS_MEM_INVALID_ADDR;
; return ((OS_MEM *)0);
; }
; if (nblks < 2) { /* Must have at least 2 blocks per partition */
; *err = OS_MEM_INVALID_BLKS;
; return ((OS_MEM *)0);
; }
; if (blksize < sizeof(void *)) { /* Must contain space for at least a pointer */
; *err = OS_MEM_INVALID_SIZE;
; return ((OS_MEM *)0);
; }
; #endif
; OS_ENTER_CRITICAL();
; pmem = OSMemFreeList; /* Get next free memory partition */
; if (OSMemFreeList != (OS_MEM *)0) { /* See if pool of free partitions was empty */
; OSMemFreeList = (OS_MEM *)OSMemFreeList->OSMemFreeList;
; }
; OS_EXIT_CRITICAL();
; if (pmem == (OS_MEM *)0) { /* See if we have a memory partition */
; *err = OS_MEM_INVALID_PART;
; return ((OS_MEM *)0);
; }
; plink = (void **)addr; /* Create linked list of free memory blocks */
; pblk = (INT8U *)addr + blksize;
; for (i = 0; i < (nblks - 1); i++) {
; *plink = (void *)pblk;
; plink = (void **)pblk;
; pblk = pblk + blksize;
; }
; *plink = (void *)0; /* Last memory block points to NULL */
; pmem->OSMemAddr = addr; /* Store start address of memory partition */
; pmem->OSMemFreeList = addr; /* Initialize pointer to pool of free blocks */
; pmem->OSMemNFree = nblks; /* Store number of free blocks in MCB */
; pmem->OSMemNBlks = nblks;
; pmem->OSMemBlkSize = blksize; /* Store block size of each memory blocks */
; *err = OS_NO_ERR;
; return (pmem);
; }
; /*$PAGE*/
; /*
; *********************************************************************************************************
; * GET A MEMORY BLOCK
; *
; * Description : Get a memory block from a partition
; *
; * Arguments : pmem is a pointer to the memory partition control block
; *
; * err is a pointer to a variable containing an error message which will be set by this
; * function to either:
; *
; * OS_NO_ERR if the memory partition has been created correctly.
; * OS_MEM_NO_FREE_BLKS if there are no more free memory blocks to allocate to caller
; * OS_MEM_INVALID_PMEM if you passed a NULL pointer for 'pmem'
; *
; * Returns : A pointer to a memory block if no error is detected
; * A pointer to NULL if an error is detected
; *********************************************************************************************************
; */
;
; void *OSMemGet (OS_MEM *pmem, INT8U *err)
; {
;
; void *pblk;
;
;
; #if OS_ARG_CHK_EN > 0
; if (pmem == (OS_MEM *)0) { /* Must point to a valid memory partition */
; *err = OS_MEM_INVALID_PMEM;
; return ((OS_MEM *)0);
; }
; #endif
; OS_ENTER_CRITICAL();
; if (pmem->OSMemNFree > 0) { /* See if there are any free memory blocks */
; pblk = pmem->OSMemFreeList; /* Yes, point to next free memory block */
; pmem->OSMemFreeList = *(void **)pblk; /* Adjust pointer to new free list */
; pmem->OSMemNFree--; /* One less memory block in this partition */
; OS_EXIT_CRITICAL();
; *err = OS_NO_ERR; /* No error */
; return (pblk); /* Return memory block to caller */
; }
; OS_EXIT_CRITICAL();
; *err = OS_MEM_NO_FREE_BLKS; /* No, Notify caller of empty memory partition */
; return ((void *)0); /* Return NULL pointer to caller */
; }
; /*$PAGE*/
; /*
; *********************************************************************************************************
; * RELEASE A MEMORY BLOCK
; *
; * Description : Returns a memory block to a partition
; *
; * Arguments : pmem is a pointer to the memory partition control block
; *
; * pblk is a pointer to the memory block being released.
; *
; * Returns : OS_NO_ERR if the memory block was inserted into the partition
; * OS_MEM_FULL if you are returning a memory block to an already FULL memory
; * partition (You freed more blocks than you allocated!)
; * OS_MEM_INVALID_PMEM if you passed a NULL pointer for 'pmem'
; * OS_MEM_INVALID_PBLK if you passed a NULL pointer for the block to release.
; *********************************************************************************************************
; */
;
; INT8U OSMemPut (OS_MEM *pmem, void *pblk)
; {
;
;
;
; #if OS_ARG_CHK_EN > 0
; if (pmem == (OS_MEM *)0) { /* Must point to a valid memory partition */
; return (OS_MEM_INVALID_PMEM);
; }
; if (pblk == (void *)0) { /* Must release a valid block */
; return (OS_MEM_INVALID_PBLK);
; }
; #endif
; OS_ENTER_CRITICAL();
; if (pmem->OSMemNFree >= pmem->OSMemNBlks) { /* Make sure all blocks not already returned */
; OS_EXIT_CRITICAL();
; return (OS_MEM_FULL);
; }
; *(void **)pblk = pmem->OSMemFreeList; /* Insert released block into free block list */
; pmem->OSMemFreeList = pblk;
; pmem->OSMemNFree++; /* One more memory block in this partition */
; OS_EXIT_CRITICAL();
; return (OS_NO_ERR); /* Notify caller that memory block was released */
; }
; /*$PAGE*/
; /*
; *********************************************************************************************************
; * QUERY MEMORY PARTITION
; *
; * Description : This function is used to determine the number of free memory blocks and the number of
; * used memory blocks from a memory partition.
; *
; * Arguments : pmem is a pointer to the memory partition control block
; *
; * pdata is a pointer to a structure that will contain information about the memory
; * partition.
; *
; * Returns : OS_NO_ERR If no errors were found.
; * OS_MEM_INVALID_PMEM if you passed a NULL pointer for 'pmem'
; * OS_MEM_INVALID_PDATA if you passed a NULL pointer for the block to release.
; *********************************************************************************************************
; */
;
; #if OS_MEM_QUERY_EN > 0
; INT8U OSMemQuery (OS_MEM *pmem, OS_MEM_DATA *ppdata)
; {
;
;
;
; #if OS_ARG_CHK_EN > 0
; if (pmem == (OS_MEM *)0) { /* Must point to a valid memory partition */
; return (OS_MEM_INVALID_PMEM);
; }
; if (ppdata == (OS_MEM_DATA *)0) { /* Must release a valid storage area for the data */
; return (OS_MEM_INVALID_PDATA);
; }
; #endif
; OS_ENTER_CRITICAL();
; ppdata->OSAddr = pmem->OSMemAddr;
; ppdata->OSFreeList = pmem->OSMemFreeList;
; ppdata->OSBlkSize = pmem->OSMemBlkSize;
; ppdata->OSNBlks = pmem->OSMemNBlks;
; ppdata->OSNFree = pmem->OSMemNFree;
; OS_EXIT_CRITICAL();
; ppdata->OSNUsed = ppdata->OSNBlks - ppdata->OSNFree;
; return (OS_NO_ERR);
; }
; #endif /* OS_MEM_QUERY_EN */
; /*$PAGE*/
; /*
; *********************************************************************************************************
; * INITIALIZE MEMORY PARTITION MANAGER
; *
; * Description : This function is called by uC/OS-II to initialize the memory partition manager. Your
; * application MUST NOT call this function.
; *
; * Arguments : none
; *
; * Returns : none
; *
; * Note(s) : This function is INTERNAL to uC/OS-II and your application should not call it.
; *********************************************************************************************************
; */
;
; void OS_MemInit (void)
; {
; #if OS_MAX_MEM_PART == 1
; OSMemFreeList = (OS_MEM *)&OSMemTbl[0]; /* Point to beginning of free list */
; OSMemFreeList->OSMemFreeList = (void *)0; /* Initialize last node */
; OSMemFreeList->OSMemAddr = (void *)0; /* Store start address of memory partition */
; OSMemFreeList->OSMemNFree = 0; /* No free blocks */
; OSMemFreeList->OSMemNBlks = 0; /* No blocks */
; OSMemFreeList->OSMemBlkSize = 0; /* Zero size */
; #endif
;
; #if OS_MAX_MEM_PART >= 2
; OS_MEM *pmem;
; INT16U i;
;
;
; pmem = (OS_MEM *)&OSMemTbl[0]; /* Point to memory control block (MCB) */
; for (i = 0; i < (OS_MAX_MEM_PART - 1); i++) { /* Init. list of free memory partitions */
; pmem->OSMemFreeList = (void *)&OSMemTbl[i+1]; /* Chain list of free partitions */
; pmem->OSMemAddr = (void *)0; /* Store start address of memory partition */
; pmem->OSMemNFree = 0; /* No free blocks */
; pmem->OSMemNBlks = 0; /* No blocks */
; pmem->OSMemBlkSize = 0; /* Zero size */
; pmem++;
; }
; pmem->OSMemFreeList = (void *)0; /* Initialize last node */
; pmem->OSMemAddr = (void *)0; /* Store start address of memory partition */
; pmem->OSMemNFree = 0; /* No free blocks */
; pmem->OSMemNBlks = 0; /* No blocks */
; pmem->OSMemBlkSize = 0; /* Zero size */
;
; OSMemFreeList = (OS_MEM *)&OSMemTbl[0]; /* Point to beginning of free list */
; #endif
; }
; #endif /* OS_MEM_EN */
; *** sync lost ***
; *** sync lost ***
; *** sync lost ***
END
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